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Commit | Line | Data |
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1 | //#test return 151 | |
2 | ||
3 | /* example tree from http://en.wikipedia.org/wiki/Huffman_coding */ | |
4 | ||
5 | int getbyte(int byte) | |
6 | { | |
7 | if (byte == 0) return 106; | |
8 | if (byte == 1) return 139; | |
9 | if (byte == 2) return 120; | |
10 | if (byte == 3) return 183; | |
11 | if (byte == 4) return 69; | |
12 | if (byte == 5) return 197; | |
13 | if (byte == 6) return 147; | |
14 | if (byte == 7) return 207; | |
15 | if (byte == 8) return 35; | |
16 | if (byte == 9) return 155; | |
17 | if (byte == 10) return 122; | |
18 | if (byte == 11) return 244; | |
19 | if (byte == 12) return 125; | |
20 | if (byte == 13) return 215; | |
21 | if (byte == 14) return 69; | |
22 | if (byte == 15) return 219; | |
23 | if (byte == 16) return 2; | |
24 | if (byte == 17) return 224; | |
25 | puts("FAIL [abort]: request for byte #"); | |
26 | puthex(byte); | |
27 | while(1); | |
28 | return 0; | |
29 | } | |
30 | ||
31 | int getbit(int bp) | |
32 | { | |
33 | int byte; | |
34 | byte = getbyte(bp/8); | |
35 | return (byte >> (7 - (bp % 8))) & 1; | |
36 | } | |
37 | ||
38 | int h(int bitpos) | |
39 | { | |
40 | if (getbit(bitpos)) | |
41 | return h1(bitpos+1); | |
42 | else | |
43 | return h0(bitpos+1); | |
44 | } | |
45 | ||
46 | int h0(int bitpos) | |
47 | { | |
48 | if (getbit(bitpos)) | |
49 | return h01(bitpos+1); | |
50 | else | |
51 | return h00(bitpos+1); | |
52 | } | |
53 | ||
54 | int h00(int bitpos) | |
55 | { | |
56 | if (getbit(bitpos)) | |
57 | return h001(bitpos+1); | |
58 | else | |
59 | return 69+h(bitpos+1); | |
60 | } | |
61 | ||
62 | int h001(int bitpos) | |
63 | { | |
64 | if (getbit(bitpos)) | |
65 | return h0011(bitpos+1); | |
66 | else | |
67 | return 78+h(bitpos+1); | |
68 | } | |
69 | ||
70 | int h0011(int bitpos) | |
71 | { | |
72 | if (getbit(bitpos)) | |
73 | return 79+h(bitpos+1); | |
74 | else | |
75 | return 85+h(bitpos+1); | |
76 | } | |
77 | ||
78 | int h01(int bitpos) | |
79 | { | |
80 | if (getbit(bitpos)) | |
81 | return h011(bitpos+1); | |
82 | else | |
83 | return 65+h(bitpos+1); | |
84 | } | |
85 | ||
86 | int h011(int bitpos) | |
87 | { | |
88 | if (getbit(bitpos)) | |
89 | return 77+h(bitpos+1); | |
90 | else | |
91 | return 84+h(bitpos+1); | |
92 | } | |
93 | ||
94 | int h1(bitpos) | |
95 | { | |
96 | if (getbit(bitpos)) | |
97 | return h11(bitpos+1); | |
98 | else | |
99 | return h10(bitpos+1); | |
100 | } | |
101 | ||
102 | int h10(bitpos) | |
103 | { | |
104 | if (getbit(bitpos)) | |
105 | return h101(bitpos+1); | |
106 | else | |
107 | return h100(bitpos+1); | |
108 | } | |
109 | ||
110 | int h100(bitpos) | |
111 | { | |
112 | if (getbit(bitpos)) | |
113 | return h1001(bitpos+1); | |
114 | else | |
115 | return 73+h(bitpos+1); | |
116 | } | |
117 | ||
118 | int h1001(bitpos) | |
119 | { | |
120 | if (getbit(bitpos)) | |
121 | return 80+h(bitpos+1); | |
122 | else | |
123 | return 88+h(bitpos+1); | |
124 | } | |
125 | ||
126 | int h101(bitpos) | |
127 | { | |
128 | if (getbit(bitpos)) | |
129 | return h1011(bitpos+1); | |
130 | else | |
131 | return 72+h(bitpos+1); | |
132 | } | |
133 | ||
134 | int h1011(bitpos) | |
135 | { | |
136 | if (getbit(bitpos)) | |
137 | return -2169; | |
138 | else | |
139 | return 83+h(bitpos+1); | |
140 | } | |
141 | ||
142 | int h11(bitpos) | |
143 | { | |
144 | if (getbit(bitpos)) | |
145 | return 32+h(bitpos+1); | |
146 | else | |
147 | return h110(bitpos+1); | |
148 | } | |
149 | ||
150 | int h110(bitpos) | |
151 | { | |
152 | if (getbit(bitpos)) | |
153 | return 70+h(bitpos+1); | |
154 | else | |
155 | return h1100(bitpos+1); | |
156 | } | |
157 | ||
158 | int h1100(bitpos) | |
159 | { | |
160 | if (getbit(bitpos)) | |
161 | return 76+h(bitpos+1); | |
162 | else | |
163 | return 82+h(bitpos+1); | |
164 | } | |
165 | ||
166 | void j4cbo() | |
167 | { | |
168 | int x; | |
169 | if ((x = h(0)) != 151) { | |
170 | puthex(x); | |
171 | puts(" -> FAIL\n"); | |
172 | } else | |
173 | puts("PASS\n"); | |
174 | } |